Greetings,

I first got started with CPLD's with the CPLD trainer from plasmo. I only dabbled a bit from examples in books and others. This time I took on another challenge. I have a bunch of TIL305/LTP305/LRT1704 5x7 dot matrix displays. Also, some newer ones from Pimoroni. My goal? Output the hex ...

Looking at the datasheets, pin assignments of DIP AS6C1008 are the same as pin assignments of SOJ CY7C109. Pin 1 is NC, pins 13-15, pins 17-21 are data, chip enable active low is 22, chip enable active high is 30, output enable is 24 and write enable is 29. VCC is 32 and GND is 16. I don't see any ...

The short answer is: yes, it is pin-to-pin connections between AS6C1008 and CY7C109. CS2 (pin 30) of CY7C109 and AS6C1008 is enabled by driving high with CPLD output.
Bill

Hello Bill,

I was wondering if it was a pin to pin connection because the surface mount part pinouts differ from the DIP ...

I never documented the design! Hmmm, I've made several designs in that topic area (piggyback VGA); you can see an assembled stack here .

I'll fix that soon, but attached are schematic and gerber photoplots. The short answer is: yes, it is pin-to-pin connections between AS6C1008 and CY7C109. CS2 ...

The modified trainer appears to work at 25.175MHz. Adjusting the baud clock generator and testing with 29.5MHz clock, I see it'll boot and execute the monitor commands but memory diagnostic is failing intermittently so I believe the design is on the hairy edge at 29.5MHz. I'm a bit disappointed ...

Very nice ROM emulator! I like the idea of emulators or added functions in form of 32-pin DIP or 40-pin DIP.

In this particular case the CPLD is flexible and has spare capacity so diagnostic function and/or test points can be easily added to solve a specific problem during hardware development ...

I have not tried 6809, yet. It needs nearly 40 manual wiring; I have a bit of time this weekend so I may give it a try.

Are you using Altera(Intel) CPLD or Atmel? If you are new to CPLD, getting CPLD tool chain to work is probably the most challenging part of the project.
Bill

I have on hand ...

Very promising for retro investigators especially if 6809 proves out. One board for comparing the major players in the vintage age.

I am starting to assemble the PCB and have Z80, 6502 and 6809. Interested in 6809, as well. 6809E with external Q/E via a quadrature clock may be interesting with ...